Nokia 7705 SAR - 3.11.2.16 Configuring LAG Parameters

7705 SAR Interfaces
260
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.11.2.16 Configuring LAG Parameters
Observe the following general rules and conditions when configuring LAGs.
• All ports (links) in a LAG must share the same characteristics (speed, duplex,
hold-timer, and so on). The port characteristics are inherited from the primary
port.
• Autonegotiation must be disabled or set to limited mode for ports in a LAG, in
order to guarantee a specific port speed.
• Ports in a LAG must be configured as full duplex.
• Ports in a LAG must be configured with the same encapsulation value.
• LAG is supported on Ethernet access, network, and hybrid ports.
• On access ports, the links must be distributed over two different adapter cards
or different MDAs on the 7705 SAR-X, in order to minimize the effect of an
adapter card failure on the LAG.
• On network ports, the links can be on the same platform or adapter card/module
or distributed over multiple components.
• A LAG can be in active/active mode or in active/standby mode for access,
network, or hybrid mode. Active/standby mode is a subset of active/active mode
if subgroups are enabled.
• By default, LACP is disabled. LACP operates in two modes: passive and active.
If the mode on the CE end is passive, the LACP mode on the 7705 SAR end
must be active.
• Each link in a LAG must be a member of a subgroup. On access, network or
hybrid ports, a LAG can have a maximum of four subgroups and a subgroup can
have links up to the maximum number supported on the LAG. LAG is
active/active if there is only one sub-group. LAG is active/standby if there is more
than one subgroup.
• The port with the highest priority is the primary port. If multiple ports have the
same priority, the port with the lowest port ID becomes the primary port.
• A port on standby can be replaced while the active port in the LAG is operational.
Note: LACP cannot be configured for static LAG. For more information on static
LAG, see Static LAG (Active/Standby LAG Operation without LACP).